Receiver sight



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RECEIVER SIGHT Filed Jan. 10, 1938 2 Sheets-Sheet l g lNVENTOaR E warmmum Aug. 20, 1940.. F. A KUHN 2,211,953

; RECEIVER SIGHT Filed Jan. 10, 1938 2 -Sheet-Sheet 2 aa 29 as mmmmw 1INVENTOR gmamv .yawjw ATTORNEY Patented Aug. 20, 1940 UNITED STATES repWW] Wt PATENT OFFICE RECEIVER SIGHT Frederick A. Kuhn, Meriden, Conn.

Application January 10, 1938, Serial No. 184,198

2 Claims.

My invention relates to a gun sight and more especially to a rear orreceiver sight for a rifle.

It is well known in the art that the best results from a rear sight, ofthe aperture or peep type, are obtained when the sight is positioned ona rifle with the aperture or peep as close to the shooters eye aspossible. As a result, there came to use at an early date a form ofsight known as a tang sight, which was mounted on the upper tang of arifle at the small of the stock. Tang sights are not suitable for use onbolt action rifles, owing not only to the fact that such rifles do nothave tangs but also to the fact that a tang sight would interfere withthe rearward movement of the bolt. For this type of rifle there has beendeveloped a form of sight which is attached to the receiver of therifle, usually at that portion rearwardly of the magazine or loadingopening known as the bridge. By reason of the fact that the bolt headand cocking piece of the usual bolt action rifle extend rearwardly ofthe bridge a considerable distance, it will be apparent that the usualreceiver sight, when mounted on the bridge, is spaced forwardly aconsiderable distance from the shooters eye.

One of the principal objects of the present invention is to bring abouta form of sight which may be suitable for attachment directly to thereceiver of a rifle, especially a bolt action rifle. and in which thesighting aperture is carried in a position closely adjacent the shooterseye.

A further object of the invention is to bring about a form of receiversight of the above character, in which the sighting aperture is in thesame general location as the aperture of a tang sight, but which willnot interfere with the operation of the bolt of a bolt action rifle.

Bolt action rifles of standardized manufacture are of the same lengthfrom the action to the butt plate, and as these are used by shooters ofdififerent physical characteristics it will be apparent that theposition of the shooters head on the comb of the rifle stock, when theshooter is holding the rifle in a normal comfortable position, will varyfrom shooter to shooter. When the rear sight is likewise standardized,both as to form and position on the rifle, it will be apparent that thedistance, from the sighting disc or aperture of the sight of theshooters eye, will vary in accordance with this position of the shootershead on the rifle stock. Again, it has been found that the normalposition of the head on the stock of a rifle varies in accordance withthe shooting position. Thus the head and the eye are much closer to theaperture of the sight in prone position than in ofi-hand position.

Another object of the invention is to bring about a form of sight inwhich the position of the peep or aperture may be adjusted or variedlongitudinally of the rifle, so that the position thereof may suit theindividual needs of a shooter, either as to his physical characteristicsor as to the particular position adopted.

In carrying out the invention I propose to mount the improved sight onthe receiver of a rifle and to extend the aperture supporting partthereof rearwardly from the receiver, into a position closely adjacentthe eye of the shooter, and a further object of the invention is tobring about a form of sight, having the above characteristics, in whichthe principal parts thereof may be readily detached, in order that thesight may not interferewith the use of a telescope sight, and for otherpurposes.

A feature of the invention resides in an arrangement wherein theaperture and associated parts of the sight may be readily detached fromand reassembled on the rifle, without requiring the readjustment thereofinto sighting position.

Further features of the invention reside in improved constructionaldetails which bring about greater ease and accuracy in the adjustment ofthe sight into sighting position.

To these and other ends, the invention consists in the novel featuresand combinations of parts to be hereinafter described and claimed.

In the drawings,

Fig. 1 is a perspective side elevational view of a rifle having a sightin accordance to the inven- 35 tion attached thereto;

Fig. 2 is a plan view of the sight shown in Fig. 1;

Fig. 3 is a side elevational view of the sight shown in Fig. 2;

Fig. 4 is a cross-sectional view taken along line l4 of Fig. 3;

Fig. 5 is a longitudinal sectional view taken along line 5-5 of Fig. 3;

Fig. 6 is a cross-sectional view taken 66 of Fig. 3; and

Fig. '7 is a view similar to Fig. 1 but with a detachable part of thesight removed.

Referring now to the drawings, in which I have illustrated my inventionby showing a preferred embodiment of the same, the reference numeral l0indicates, in general, a bolt action rifle having a receiver H, thebridge I2 of which, in this instance, is provided with a transversedove-tail along line slot I3, in the upper face thereof. In thepreferred form of the invention shown herein I take advantage of thisdove-tail slot to support the improved sight, generally designated bythe reference numeral I4, on the rifle ID.

The sight I4 includes, a supplemental base I5,

having, at the forward end thereof, a dove-tail I6, adapted to bereceived in the dove-tail slot I3, of the receiver, the supplementalbase at its rear end extending laterally outwardly and downwardly at I1,to provide for the connection of the supplemental base I5 to base I8, byextension I9.

The extension I9 is of a length to space the base I8, which carries theaperture 29 of the sight in a manner to be hereinafter described, atsuch a distance rearwardly of the receiver I2 as to bring the apertureclosely adjacent the comb 2| of the rifle. In the particular instanceshown, the extension I9, at least through part of its length, as at 22,is of cylindrical rod-like shape and for convenience of manufacture, isof uniform diameter from end to end and mounted in or rigidly attachedto base I8, the rod-like part of the extension extending forwardly fromthe base I8, in a direction parallel to the axis of the rifle barrel, tobe detachably secured in an opening 23, in the supplemental base I5.

In order that the aperture 20 may be adjusted longitudinally of therifle, into a position suitable for the needs of an individual shooter,the opening 23, in the instance shown, extends entirely through the partI1 of supplemental base I5, the cylindrical part 22 being movableaxially of opening 23 and held against movement, when in adjustedposition, by a clamping plate 24, mounted in the vertical outwardlyfacing slot 25, in supplemental base I5, the plate 24 being forcedagainst the extension by means of a clamp screw 26, extending throughthe plate 24 and threaded in part I1, of supplemental base I5. In orderto control rotational movement of the cylindrical part 22, of theextension, in the opening 23, of supplemental base I5, the cylindricalpart 22 is flattened through at least part of its length, as at 21, theflattened portion 21 being engaged by the upper end of plate 24.

It will be readily understood without further description that byloosening the clamping screw 26, and thus the clamping plate 24, thecylindrical part 22, of the extension, may be freely withdrawn from orinserted into the opening in the supplemental base I5 and adjusted backand forth therein. When inserted or adjusted in opening 23, to a pointeffecting a desired position of the aperture 29, the clamp screw 26 maybe tightened to hold the extension, and thus the base I 8, againstfurther movement. The cylindrical portion of the extension closely fitsthe opening 23 and the flattened portion 21 is parallel to the axis ofthis cylindrical portion, so that after adjustment of the latter,backwards or forwards in opening 23, the engagement of plate 24, withthe portion 21, will effect rotation of the extension to bring theflattened portion 21 into a substantially vertical position, and thusthe aperture into normal sighting position.

For the purpose of locking the supplemental base I5 and the extensionelement I9 against relative movement, as well as to form a convenientmeans for insuring that these parts may be returned to any position ofadjustment after the extension element is separated from thesupplemental base I5, a series of equally spaced vertical slots 28 arecut into the face 21, of extension element I9, the upper end of theplate 24 having spaced ribs 29 adapted to enter the slots 28. As theslots and ribs have the same center to center spacing it will beapparent that the ribs may enter the slots at any portion of element I9at the flattened portion 21 thereof. The plate 24, at its lower end, isprovided with a longitudinally directed rib or toe 39 hearing againstthe supplemental base |5 at the lower end of slot 25, the plate swingingon the toe 30, as the clamp screw 26 is tightened, to cause the ribs 29to enter the slots 28 to lock the extension element against rotation andmovement in the direction of its axis. Preferably the sides of each rib29 are tapered towards one another towards their outer edges, the slots28 having a similar taper so that engagement of the plate 24 andextension element I9 is limited to the sides of the ribs and slots.

It is common practice in receiver sights to mount the aperture on avertically movable slide, the latter being adjusted in a verticaldirection by a screw, mounted on the slide and engaging a threaded nutcarried on the base. As the aperture, in most instances, interferes withthe use of a telescope sight, it is common practiceto mount the nut, inthe base, so that the threads thereof may be disengaged from theadjusting screw to permit free withdrawal of the slide from the base.During the normal use of the screw for adjusting purposes the nut ispressed'against the threads of the screw by a spring. In the presentinstance, owing to the detachable connection of the extension elementwith the base I1, I am able to dispense with the use of a movable nutand the elevation and windage adjustments may be kept at proper settingat all times.

In the form of the invention shown in the drawings the aperture disc 29is supported in usual manner for transverse movement on the horizontalarm 3|, of slide 32, the latter being of inverted L-shape and having avertical arm 33, supported on base I8, for movement in a verticaldirection, arms 3| and 33 being at right angles to one another with arm33 vertically and arm 3| horizontally disposed. The arm 33 is ofdove-tail cross-sectional shape and supported in an outwardly facingvertical slot 34, in base I8, the base I8 at one of the side edges ofthe slot 34 fitting the adjacent dove-tail edge of the arm 33 and at theother side edge, of the slot 34, tapering outwardly to receive theadjacent face of clamping plate or wedge 35, the latter being mountedbetween the slide arm 33 and the base I8 at the edge of the slot 34.

Vertical adjustment of slide 32 is brought about by vertical adjustingscrew 36, having a stem 31, mounted for rotation in arm 3| and having alower threaded end 38, received in a vertical threaded opening 39, ofbase I8, the opening 39 being preferably threaded its entire length.Axial movement of screw 36, in arm 3| in one direction is prevented bythe engagement of shoulder 40, on screw 36, with the under side of arm 3I, movement in the opposite direction being prevented by the engagementof finger piece or screw head 4|, mounted on the upper end of stem 31,with the upper face of arm 31.

A click spring 42, of usual form, mounted in a recess in the upper faceof arm 3|, engages the lower end of screw head 4|, to control therotational movement of the head 4|, and thus screw 36, in well knownmanner. In order that there may be no lost motion, between the screw 36,slide 32, and base I8, during the rotation of screw 36, and so thatsmall movements of rota- GtUWlETRlCAL INSTRUMENTS.

tion of screw 36 may be reflected in corresponding movements of theslide, the base I8 is bored or drilled at 43, to receive a shoe 44,which is pressed against the screw 36, by a screw 45, threaded inopening 43, the shoe pressing the screw into tight engagement with thethreads of opening 39. The upper end of head 4| is counterbored toreceive a screw 46, thread-ed in stem 31 and drawing the head 4|downwardly on the stem 3'! until the lower end of the head engages theupper face of arm 3|, the shoulder 40 at this time being in engagementwith the under face of arm 3|, screw 46, threaded in head 4|, engagingthe stem 31 to hold the head thereon against movement with respect tothe stem.

The typical rifle, shown in Figs. 1 and '7, is provided with a receiverH. in which a longitudinally movable bolt 48 is mounted, the latterhaving a bolt head 49 and cooking piece 50 which extend a considerabledistance rearwardly of the receiver I2. The supplemental base |5 ismounted on the receiver I2 in the position normally occupied by theusual receiver sight. It will be noted that a sight so positioned is ata considerable distance from the comb 2| and that in any event it wouldbe impossible to bring the eye of the shooter very close to the sight asit is necessary to avoid contact with the cocking piece 50. In thepresent instance the extension 22 brings the sight into a positionrearwardly of the receiver H such that the aperture 2|] is closelyadjacent the comb 2| or at least rearwardly of the cocking piece 50 to asufficient extent so that the shooter may bring his eye close to theaperture.

Elevation and. windage or lateral adjustments of the sight are broughtabout by rotation of screws 36 and 5| in well known manner and it willbe apparent that as the axis of extension 22 is parallel to the axis ofthe rifle barrel the sight base |8 may be adjusted longitudinally of therifle without efiecting the sight adjustment in any material way. Theribs 29 of the clamping plate 24 and the grooves 28 of the extension 22co-operate to lock the extension against longitudinal as well asrotational movement and serve as guides to the shooter in restoring thesight to original adjustment after the base l8 and extension 22 havebeen separated from supplemental base 5. In order to lock the slide 32against movement the wedge 35 may be pressed against the slide arm 33 byclamp screw 52. 5

While I have shown and described a preferred form of the invention, itwill be readily understood that it is not to be limited to the detailsshown, but is capable of modification and variation within the spirit ofthe invention and the scope of the appended claims.

What I claim is:

1. In a receiver sight for a rifle, a sight carrying base, asupplemental base adapted to be attached to the rifle, an extensionrigidly connected to the sight carrying base and extending towards andhaving its outer end mounted in said supplemental base, said end beinggenerally cylindrical and said supplemental base having a cylindricalopening parallel to the axis of the rifle barrel 20 open at one side, aclamping plate on the supplemental base, said plate and extension endhaving co-operating ribs and grooves, and means for clamping said platein said open side against the extension end with said ribs and groovesinterengaging to restrain longitudinal movement of the extension in thecylindrical opening.

2. In a receiver sight for a rifle, a supplemental base adapted to beattached to the receiver of a rifle and having a cylindrical openingtherein the axis of which is parallel to the axis of the rifle barrelopen at one side, a sight carrying base, an extension rigidly attachedto the sight carrying base and extending longitudinally towards thesupplemental base, said extension at least at its outer end beingcylindrical and received in the cylindrical opening of the supplementalbase, there being a flat vertical face on the extension end and a seriesof spaced vertical outwardly facing grooves cut into the extension endthrough said face, a clamping plate mounted on said supplemental base, aseries of spaced ribs on said plate received in the grooves of theextension end, and means for urging the plate in said open side againstthe extension end.

FREDERICK A. KUHN.

